Thread parting mechanism for looms



March 27, 1934. F. E. DOUGLAS THREAD PARTING MECHANISM FOR LOOKS Filed May 8, 1933 2 SheetsSheet 1 IN VEN TOR.

FEEDE/C E. DOUGL A5.

BYM

ATTORNEY.

March 27, 1934. F. E. DOUGLAS THREAD PARTING MECHANISM FOR LOOKS Filed May 8, 1933 2 Sheets-Sheet 2 IN VEN TOR.

F/LEDE/C E. DOUGLA s l M m (IL/N TON J. Cosy/21v.

ATTORNEY.

Patented Mar. 27, 1934 UNITED STATES PATENT OF'FIQE Fredric E. Douglas, ntpeaaie, Massl, es'sigiior to Draper Corporation, nopeaele, it our:

poration (if Maine Application May 8, 1933, Serial No. 669,882

9 claims.

' The present invention relates to intermittently operating thread parting mechanisms for looins and more particularly relates to such m chanisms of the type usuall-y' mounted on or adjacent the temple and operated a predetermined number of times immediately after each filling replenishingoperation,- for the purpose of parting the filling ends left projecting from the selvage at that time.

The principle object 6i my invention is to produce a thread parting mechanism, or the t pe specified, which shall be simple, extremely oompact,- and devoid of all unnecessary parts.

I achieve both compactness and simplicity or construction by so constructing and positioning- ,the few parts or the mechanism that a single part may erform aplural-ity of functions while each part cooperates directly with associated parts. For detailed disclosure of the preferred embodiment of my invention, reference ma be had to' the accompanying drawings, of which:

Fig.- 1 is a side elevation ofa 100m temple enibodying my invention, the temple stand being omitted and the temple bar being broken away;

Fig 2 is a view 'sin'iilai to Fig. 1 but with the cover plate partially broken away to expose the mechanism normally covered thereby;

Fig} 3 is a plan View of the temple shown in Fig. 1; and

Fig. 4 is a view sirnilar to Fig; 3, but with certain of the parts broken away and appearing in section.

The main body Of the temple,- to whicili my invention has been applied, is carried by a bar 1 which may be Iridiihtd iii a housing supported on a temple stand on the breast beam of the 100m in any usual manner, such parts being not illustrated. This main of the temple, usually referred to as the temple head; is conveniently constituted by a pair (if castinga'the upper one, 2,

Of Which forms the cap 3 for Z temple 1011 01" rolls (not shown) and the cover 4 for the thread parting mechanism; The lower castings in addie tion to forming the pod also forms the base 6 of the housing for the thread parting mechanism and may be extended to form a heel 7 by which the temple is reciprocated. The two casting's may be held togetherby a screw S.

A guideway' 8, positioned substantially in a vertical plane and extending through the temple head from front to rear thereof, is" preferably formed entirely in the-cover 4. Within this guideway' may be positioned the threadparting members, the articular members} beingooh-- s'titiited bye lohifiatldg er blade 9 amfl a rock able and slidable' cutter blade 10 movame the Vertical plane of the guideway. The moi able inem'berifi is given its forward cutting stroke by means of the depending arm 11, and isre turned rearwardly by the spring 12.

The temple as thus far described is em and well known in the art. The thread parting ineni'-' bers' are net of the present invention, but are dis closed and claimed in my co'p'en din'g application Serial Number 625,763, filed July 29, 1932, now Patent Number 1,914,653, granted June 20", 1933. Accordingly, none of these parts need be further illustrated.- or described, and it is to be under stoodthat any other suitablepart's' or arrange ment of parts niay be used if so desired, as the present invention provicles a device, in the new hire of a ratchet timing device for looking a thread parting member out of operation ate predetermined time, which is independent of the articular forth of parting members employed or the exact manner oiz mounting the same on the 100m;

The most satisfactory exam'me of a manner in which the parts ofthe mechanism may be constructed and arranged in order to procure that compactness and; simplicity which constitutes the essence or-n y' ihveritioti i's that shown on the drawings; Therein, amtehet device, preferably in the form of a ratchet wheel 13, is positioned adjacent the plane in winch the thread parting member 10 operates. To this end the ratchet wheel may be rotatably mounted. on a; pin 14 pro jecting vertically upward from the face of the basefi.

Positioning the ratchet Wheel 13' so close to the plane of the thread parting member permits operating thelforfnei by a pawl which maybe carried. direeuy by the member 10. Ihaile de vised a pawl 15 for this purpose, which pawl is constitutedby a flat piece of spring steel having its forward end fixed to the member 10' as by a rivet 16 and having its" rearward free end' 17 biased into engagement with, teeth 18' forrhed on the'circum'fe'rential face of the ratchet wheel. It will be apparent that when the thread parting member 10 isg'ii en its'forward cutting move ment the pawl 15' wiiisprin'g enough to ride over a tooth 18' to a position where, upon the return Ofnieniber 10 was rearward position, the pawlj will move the ratchet wheel clockwise, Figs. 3" and 4, one tootm I The arrangementof thread parting member, pawl and ratchet device just described; or the permitted range of equivalents, combined.- with an? suitable means Controlled" by the ratchet-device for rendering the thread partingmember inoperative, constitutes one phase of my invention. However, I have gone further and provided a novel form of such means which is also considered a part of my invention.

To this end, I have formed on the cover 4 a vertical extension 19 to which, and the face of the cover, is secured a cover plate 20. In the extension and cover plate is formed a guideway 21 which is shown as extending vertically, parallel to the plane of operation of the thread parting member 10. A slide 22 is mounted in the guideway 21 for vertical movement therein. In its preferred form the slide, which constitutes but a single element, serves to lock the thread parting member 10 out of operation and also serves to prevent retrograde movement of the ratchet wheel 13.

The latter function of the slide 22 is accomplished by cutting out a portion of the slide, as at 23, to clear the ratchet wheel and thus providing an edge 24 which is adapted to bear against the upper face of the ratchet wheel and successively engage teeth 25 which may be formed thereon. The slide may be bevelled as at 26 to reduce the thickness of the edge 24. By means of this particular construction the ratchet wheel is made to support the slide in its elevated position while the ratchet wheel makes substantially one complete revolution.

During the time required for the ratchet wheel to make one complete revolution, the thread parting member remains in operation, and the number of times it operates depends upon the number of teeth provided on the ratchet wheel, which may vary as desired. A slot 27 in the ratchet wheel, preferably extending radially inward from the circumference thereof, is so positioned as to align with the slide 22 after the ratchet wheel has rotated to the position shown in Figs. 1 and 4. Alignment of the slot and slide permit the latter to pass through the former, i. e., to drop down from the elevated position in which it is shown in Figs. 2 and 3.

The means by which the thread parting member is rendered inoperative when the slide passes through the slot 27 is herein constituted by an upwardly and forwardly inclined edge 29 formed directly on the lower end of the slide. When the slide is in its lowered position, Fig. 1, the

g edge 29 engages a lug 30 formedon the arm 11 of the thread parting member, and thus locks the member in its forward position, against the action of the spring 12. The edge 29 is inclined in the manner indicated so that should the first engagement thereof with the lug 30 fail to retain the member 10 in its extreme forward position any subsequent movement of the latter will permit the slide to drop farther down and thus hold the member where it will not have even a very slight reciprocation during its idle period.

Any suitable means may be provided for raising the slide 22, and thus freeing the thread parting member, at the time of transfer. One convenient form of such means is a conventional Bowden wire 31 having an end housed in a housing 32 formed integrally with or attached to the cover plate 20, the upper end of the wire being adapted to bear against a projection 33 formed on theslide 22. The wire 31 may be operated at the time of transfer by any suitable usual means which forms no part of the present invention and need not be herein illustrated or described. 7

Having fully disclosed the preferred embodiment of my invention, I claim:

1. A thread parting mechanism for looms, including a thread parting member operating in a vertical plane, a ratchet wheel positioned adjacent said member and rotating about a vertical axis, a pawl carried by said member for intermittently rotating the said ratchet Wheel, and means controlled by said ratchet wheel for rendering the said member inoperative after a predetermined number of operations thereof.

2. A thread parting mechanism for looms, including a thread parting member operating in a vertical plane, a ratchet wheel positioned adjacent said member and rotating about an axis, a pawl carried by said member for intermittently rotating said ratchet wheel, a slide having means for engaging teeth formed on said ratchet wheel to prevent retrograde movement of the latter, and means on said slide for rendering said member inoperative when the said ratchet wheel occupies a predetermined position relative thereto.

- 3. A thread parting mechanism for looms, including a thread parting member operating in a vertical plane, a ratchet wheel positioned adjacent said member intermediate the ends of the latter and rotating about a vertical axis, a pawl constituted by a spring fixed at one end to said member and having its free end engaged with said ratchet wheel for intermittently rotating the latter, and means controlled by said ratchet wheel for rendering the said member inoperative after a predetermined number of operations thereof.

4. A thread parting mechanism for looms, including a thread parting member operating in a vertical plane, a ratchet wheel positioned adjacent said member and rotating about a vertical axis, a pawl carried by said member for intermittently rotating the said ratchet wheel, and a single element constituting means for preventing retrograde movement of said ratchet wheel and means for rendering said member inoperative when the said ratchet wheel occupies a predetermined position relative thereto.

5. A thread parting mechanism for looms, including a, thread parting member operating in a vertical plane, a ratchet Wheel positioned adjacent said member and rotating about a vertical axis, a pawl constituted by a spring having one end fixed to said member and having its free end biased into contact with said ratchet wheel for intermittently rotating the latter, a slide having means for engaging teeth formed on said ratchet Wheel to prevent retrograde movement of the latter, and means on said slide for rendering said member inoperative when the said ratchet wheel occupies a predetermined position relative thereto.

6. A thread parting mechanism for looms, including a thread parting member operating in a vertical plane, a ratchet wheel positioned adjacent said member and rotating about a vertical axis, said ratchet wheel having a slot, pawl means for intermittently rotating said ratchet wheel, a vertically movable slide having a portion adapted to cooperate with the upper face of said ratchet wheel to prevent retrograde movement of the latter, and means on said slide for rendering the said member inoperative when the said slot is aligned with the slide to permit endwise movement of the latter.

'7. A thread parting mechanism for looms, including a thread parting member operating in a vertical plane, a ratchet wheel positioned adjacent said member and rotating about a vertical axis, a pawl carried by said member for rotating the said ratchet wheel, there being a slot in said ratchet wheel, a vertically movable element normally bearing against said ratchet wheel but movable through the said slot when the latter is aligned therewith, and means on said element, operable when the latter moves through said slot, to engage the said member andlock it out of operation.

3. A thread parting mechanism for looms, including a thread parting member operating in a vertical plane, a ratchet wheel positioned adjacent said member and rotating about a vertical axis, a pawl carried by said member for intermittently rotating the said ratchet wheel, there being a slot in said ratchet wheel, a vertically movable slide normally bearing against said ratchet wheel but movable through the said slot when the latter is aligned therewith, and means on said element, operable when the latter moves through said slot, to engage the said member and lock it out of operation, said slide normally serving the additional purpose of preventing retrograde movement of the said ratchet wheel.

9. A thread parting mechanism for looms, including a thread parting member operating in a vertical plane, a ratchet wheel positioned adjacent said member and rotating about an axis, said ratchet wheel being provided with a slot, an element normally bearing against said ratchet wheel but movable through the said slot when the latter is aligned therewith, means whereby movement of said element through said slot renders said element inoperative, and means for intermittently rotating said ratchet wheel.

FREDRIC E. DOUGLAS. 

